// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// Copyright (c) 2008-2020 NVIDIA Corporation. All rights reserved.


#ifndef SAMPLE_TIME_H
#define SAMPLE_TIME_H

#include <stdint.h>

class Time
{
public:
	Time() : m_lastTickCount(getTimeTicks()) {}

	double Time::getElapsedSeconds()
	{
		const int64_t lastTickCount = m_lastTickCount;
		m_lastTickCount = getTimeTicks();
		return (m_lastTickCount - lastTickCount) * s_secondsPerTick;
	}

	double Time::peekElapsedSeconds() const
	{
		return (getTimeTicks() - m_lastTickCount) * s_secondsPerTick;
	}

	double Time::getLastTime() const
	{
		return m_lastTickCount * s_secondsPerTick;
	}

private:
	static double	getTickDuration()
	{
		LARGE_INTEGER a;
		QueryPerformanceFrequency(&a);
		return 1.0 / (double)a.QuadPart;
	}

	int64_t getTimeTicks() const
	{
		LARGE_INTEGER a;
		QueryPerformanceCounter(&a);
		return a.QuadPart;
	}

	int64_t				m_lastTickCount;
	static const double	s_secondsPerTick;
};


#endif